Atomic number 38
Strontium
Alkaline earth metal
Quick facts
- Atomic mass
- 87.620
- Group
- 2
- Period
- 5
- State (STP)
- solid
- Electronegativity
- 0.95
- Common ox. states
- +2
Properties
Electron configuration
[Kr] 5s²
- Ionization energy
- 549.5 kJ/mol
- Electron affinity
- 5.0 kJ/mol
- Melting point
- 1050.00 K (776.9 °C)
- Boiling point
- 1655.00 K (1381.8 °C)
How it bonds
Strontium loses both 5s electrons to make Sr²⁺ in salts (SrCO₃, SrCl₂). Its compounds give the bright crimson color in fireworks. Sr-90, a fission product, is dangerous because it tracks calcium and lodges in bone.